Democratic House Judiciary head threatens Trump with lawsuit if he declares state of emergency for border wall
President Donald Trump (Shutterstock).

Congressional Democrats revealed on Thursday a two-prong approach to block President Donald Trump from using a state of emergency declaration to bypass Congress and build his wall.

The first step will be introducing a "resolution of disapproval" in the House of Representatives, House Judiciary Chair Jerry Nadler told Washington Post congressional reporter Rachael Bade.

If their legislative branch response is blocked by Senate Republicans, House Democrats will then fight the state of emergency in the judicial branch by filing a lawsuit against the president.